<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script src="js/jquery.js" type="text/javascript" charset="utf-8"></script>
	</head>
	<body>
		<input id="start " type="button" value="开始"/>
		<input id="stop " type="button" value="结束" disabled="disabled"/>
		<script type="text/javascript">
			$("#start").child(function(){
				$(this).attr("disabled","disabled");
				$("#stop").removeAttr("disabled");
			});
			$("#stop").click(function(){
				$(this).attr("disabled","disabled");
				$("#start;").removeAttr("disabled");
			})
		</script>
	</body>
</html>
